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| Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets. |
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24th Jun 2019, 8:09 pm
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#1 |
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Tetrode
Join Date: Jun 2019
Location: Manchester, UK
Posts: 81
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Chip Challenge ?
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So ..more rifling through boxes today ..and I found this lovelly old 24 pin chip Gold top and gold pins ..but what is it ? hard to read but as best I can make out ZN440CJ 8216 I'm guessing some sort of early Prom/Eprom ? There is no obvious sticker and no exposed UV window ..and is made by Ferranti. It could be the gold top is just a label ..but I wouldn't want to just go trying to peel it off without knowing. anyone care to take a guess ? rgds VS Last edited by ViperSan; 24th Jun 2019 at 8:23 pm. |
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24th Jun 2019, 8:32 pm
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#2 |
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Heptode
Join Date: Jul 2009
Location: Stoke-on-Trent, Staffordshire, UK.
Posts: 719
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Re: Chip Challenge ?
ZN440 is a 6 bit A to D converter.
Pete |
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24th Jun 2019, 8:34 pm
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#3 |
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Octode
Join Date: Apr 2018
Location: Newbury, Berkshire, UK.
Posts: 1,287
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Re: Chip Challenge ?
Well the ZN440 is a 6 bit video A-D encoder. I presume the 'CJ' means "Ceramic J-pins" since the pins aren't visible from the top. 8216 may be a date code (16th week of 1982).
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24th Jun 2019, 8:50 pm
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#4 |
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Dekatron
Join Date: Aug 2011
Location: Newcastle, Tyne and Wear, UK.
Posts: 11,558
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Re: Chip Challenge ?
You can use it to add an analogue joystick input (or temperature sensor or light sensor) to any retro computing projects you currently have going. Just connect it to a handy parallel I/O port.
'ZN' always seems to have been a Ferranti head code. They also made the radio experimenter's favourite radio-in-a-can, the ZN414. |
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24th Jun 2019, 9:03 pm
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#5 |
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Tetrode
Join Date: Jun 2019
Location: Manchester, UK
Posts: 81
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Re: Chip Challenge ?
Thanks guys ..
If I find anything else interesting ..we can play the game again.. A nice old chip indeed. rgds VS |
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26th Jun 2019, 6:53 pm
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#6 | |
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Pentode
Join Date: Dec 2005
Location: Denton, Manchester, UK.
Posts: 187
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Re: Chip Challenge ?
Quote:
ZR for power diodes, ZS signal diodes ZT metal can transistors ZTX plastic transistors All these are silicon types, from 1955 onwards. I don't think Ferranti used Ge at all. Your ceramic package has a soldered on lid, originally a solder "picture frame " surrounds the chip area. The lid can be unsoldered to reveal the inner workings but the device is then very easily damaged but looking at the innards down a microscope can be very interesting. |
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27th Jun 2019, 12:45 am
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#7 |
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Dekatron
Join Date: Apr 2012
Location: Worksop, Nottinghamshire, UK.
Posts: 5,553
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Re: Chip Challenge ?
Those gold tops are indeed soldered on. I have in the past seen one that had a dry joint and had fallen off.
The inside is like the chip in a can transistor but many times more intricate. If a gold top is not enough take two  It is a very posh opto isolater. They were ferociously expensive back in the 1990s when a mate of mine pulled some NOS units out of his works skip. They ended up there because the board was badly laid out so that they flashed over on three phase mains. They just chucked the whole boards with mounting kits away. |
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